Hoisting apparatus



C. F. G. SCHOENKNECHT.

HOISTING APPARATUS. APPLICATION FILED MAY I0. 1920.

Patented Dec. 14, 1920.

INVENTOR 491W,

ATT NEY.

UNITED STATES GURT E. G. SGHOENKNECHT, 0F NEWARK, NEW JERSEY.

HOISTING APPARATUS.

Specification of Letters Patent.

Patented Dec. 14, 1920.

Application filed May 10, 1920. Serial No. 380,070.-

To all whom it may concern:

Be it known that I, CURT E. G. SoHonN- KNECHT, a citizen of the UnitedStates, and a resident of Newark, county of Essex, and State of NewJersey, have invented certain new and useful Improvements in HoistingApparatus, of which the following is a specification.

This invention is designed to provide a hoisting apparatus which can beused for many difierent purposes, but which is primarily designed forboth hoisting a weight quickly and causing the quick descent of theweight by release of the hoisting apparatus,

= it being particularly designed to permit the dropping of heavy weightsin such places as gas houses and the like, for the breaking up of largeparticles, such as residue, the present apparatus for this purpose beingcumbersome, requires expert manipulation and usually takes up a greatdeal of room proportionate to the work they accomplish.

The present invention takes up but little floor space, being verticallydisposed, and is operated by a single lever which controls the admissionof fluid under pressure, usually steam, to the operating cylinder, whichin turn operates a crosshead which is connected by sheaves with a cable,so that the movement of the piston is multiplied so as to quickly raisea comparatively heavy weight.

The invention further consistsin a readily adjustable means forcontrolling the movement of the manually operated steamcontrol mechanismso that the speed of movement can be limited.

The invention is further designed to provide a device of this kind, themajor portion of which is incased so that flying fragments or the likewill not be apt to damage any of the parts, and further consists invarious details which will be hereinafter more fully described andfinally embodied in the claim.

The invention is illustrated in the accompanying drawing, in whichFigure 1 is a view, one half of the cylinder and the casing above itbeing shown in section, the view also illustrating the preferred form ofcable support beyond the hoisting apparatus. Fig. 2 is a front view ofthe lower portion of the device shown in Fig. 1, and Fig. 3 is a sectionlooking downward, taken on the plane indicated by line 33 in Fig. 1.

The device comprises a cylinder which is actuated by fluid underpressure, the

form shown being a steam cylinder which has the entrance ports 11 and anexit port 12 controlled in the usual way by a slide 13 in the steamchest 14. The slide has a pro jecting stem 15 which is operated by amanual means, such as the lever 16, which is pivoted at a proper pointto the device and is hinged, as at 17, to the stem 15.

It will be evident that as the slide 13 is slid one way or the other, itwill admit steam first to one end and then to the other end of thecylinder, the end not so supplied being in communication, through itsport 11, with the exhaust port 12. In this way the direction of movementof the piston 18 is controlled.

The piston 18 is connected to a piston rod 19 which operates inside thetubular casing 20 which is secured to the top end of the cylinder bysuitable means, such as the bolts 21, and forms a cylindrical casing andhas the openings 22 to give access to the stuffing box 23 at the top ofthe cylinder.

The device is held upward by attaching it to a suitable support, theform shown including plates 24 on the cylindrical casing 20, and 25 onthe cylinder 10, by means of which the device is bolted to a wall or toa column in a building. At the top of the piston rod 19 is cross-head 26which slides freely in the casing and is provided with sheaves 27rotatable on the shaft 28 in the cross-head. The top of the casing formsa support for the shaft 29, on which are mounted the sheaves 30 and 31.The cable 32 has one end secured, in the form illustrated this securingmeans being a bolt 33 in the cross-head, the cable then passing over thesheaves 30, under the sheave 27, over the sheave 31 and under the othersheave 27, and then extends upward, as at 34, to the point where it isto support a weight or the like.

I have devised a well adapted form of pulley for taking up slack andrelieving the shock of the stoppage of the piston, the form showncomprising a support, such as an I-beam 35, from which is suspended thepulley 36, over which the cable 32 passes, the pulley 36 being mountedin a bearing 37 suspended from a plate 38 which has the bolts 39extending up through the plate 40, which rests on the I-beam 35, thesebolts sliding freely through the plate 40 and being fastened, as by nuts41, to a top plate 42. Springs 43 surround the bolts 39 and give them alimited resiliency toward the hoisting apparatus.

From this point the cable goes usually over a pulley 44 and suspends asuitable weight 45. To take up the shock within the apparatus I arrangebuffer springs 46 and 47 at the ends of the cylinder so that the piston,on dropping its limit of movement, will engage such springs 46 and 47 soas to give relief to the whole mechanism from shock.

In order to provide for a desired amount of steam being admitted to thecylinder at one time I limit the movement of the slide 13 in the steamchest, such limiting means being adjustable. In this connection I show ascrew 48 at one end of the steam chest and a screw 49 at the other end,these screws being disposed so that the steam chest will engage them inits movement, the screw 48 controlling the amount of steam that can beadmitted through the upper port 11, and the screw 49 controlling thatwhich can be admitted through regulating the proportion of the openingof the lower port 10 that is uncovered.

It will be evident that when the lever 16 is operated to push the slide13 downward, steam is admitted above the piston 18, and

the piston is forced downward, the speed thereof being, of course,controlled by the amount of steam admitted, which in turn is controlledby the position of the screw 48, it being assumed that an ordinaryworkman will move the handle to its limit of movement at the outset ofthe operation. This movement of the piston pulls down the crosshead 26since they are both secured to the piston rod 19, and the multiplicationof movement, due to the sheaves, causes the cable, with the insulationillustrated, to advance about four times the movement of the piston, sothat with a three foot stroke of the piston the weight will be raisedabout 12 feet. This raising is quickly accom plished and the lever 16 isthen swung so as to uncover the lower port 11 and the piston is thenrapidly forced upward, which permits the weight to fall and can be usedfor crushing or other purposes.

It will be evident that the weight included in this specification ismerely shown and described for the purpose of making the inventionclear, as other mechanisms than a weight can be the element influencedby the hoisting apparatus.

It will be readily understood that, if desired, the number of sheavescan be altered, and if only one of the sheaves 30 or 31 is to beemployed, the movement would be three-fold, and if only one sheave isplaced on the shaft 29 and only one sheave on the shaft 28, the movementof the weight would only be double that of the stroke of the piston.

It will be readily understood that as the piston reaches each end of itsstroke the springs 46 and 47, whichever was engaged, would take up theshock of the stoppage of the piston.

I claim:

A hoisting apparatus comprising a steam cylinder with a piston rodprojecting therefrom, a cylindrical casing mounted on the cylinder, across-head in the casing and trai 'eling with the piston rod, sheaves secured in the cross-head, a shaft at the top of the casing, sheaves onthe shaft, a cable with one end secured and then passing over thesheaves, a steam chest with a slide therein, means for manuallyoperating the slide, and readily adjustable means for limiting themovement of the slide.

In testimony that I claim the foregoing, I have hereto set my hand, this8th day of May, 1920.

CURT E. G. SCHOENKNECHT.

